JP4645146B2 - Forklift hose connector mounting structure - Google Patents

Description

  The present invention relates to a hose connector mounting structure for a forklift.

  Conventionally, a three-stage mast type forklift used as an industrial vehicle has a pair of outer masts erected on the machine base, a pair of middle masts that can be raised and lowered inside the outer mast, and the inner side of the middle mast. And a pair of inner masts arranged to be movable up and down. In addition, various attachments and working hydraulic devices such as a hydraulic cylinder and a hydraulic motor for operating the attachments are attached to a lift bracket that can be moved up and down inside the inner mast.

  In such a forklift, the working hydraulic device attached to the lift bracket includes a front hose disposed along the front cylinder for lifting and lowering the lift bracket, a rear hose disposed along the middle mast, It is connected to an oil control valve of a hydraulic pump installed on the machine base via a hose connector for connecting the rear hose to each other. Here, one working hydraulic device is driven from a pair of front hoses for feeding and returning, a pair of rear hoses, and a pair of connector pipes of hose connectors connecting the front and rear hoses. One hydraulic system is configured for this purpose.

  For example, Patent Document 1 discloses a hose connector mounting structure of a three-stage mast type forklift having two hydraulic systems for driving two working hydraulic devices mounted on a lift bracket. In this mounting structure, the bracket of the first hose connector of the first hydraulic system and the bracket of the second hose connector of the second hydraulic system are arranged up and down via the spacer, and in the space secured by the spacer. A connector pipe fixed to the upper surface of the bracket of the second hose connector is disposed, and in this state, the brackets of the first and second hose connectors are fixed to the inner mast by a common bolt.

JP-A-7-16597

However, in the hose connector mounting structure of Patent Document 1, a spacer is formed so that a space for arranging the connector pipe of the second hose connector is formed between the bracket of the first hose connector and the bracket of the second hose connector. Therefore, the number of members constituting the mounting structure is increased, resulting in a complicated configuration.
Moreover, in patent document 1, since it fixes to an inner mast with a common volt | bolt in the state which has arrange | positioned the spacer between the bracket of a 1st hose connector and the bracket of a 2nd hose connector, at the time of an assembly, a 1st hose connector and a spacer In addition, the second hose connector must be temporarily assembled and bolted in a state where they are held by hand, resulting in a problem that the assembling work is troublesome.
The present invention has been made to solve such problems, and an object of the present invention is to provide a hose connector mounting structure for a forklift that can be easily assembled with a simple configuration.

In the forklift hose connector mounting structure according to the present invention, the front hose and the rear hose of the first hydraulic system are fixed to the first bracket of the first hose connector with respect to the forklift having the first and second hydraulic systems. A forklift hose connector mounting structure for connecting the front hose and the rear hose of the second hydraulic system to each other by a second connector pipe fixed to the second bracket of the second hose connector, both first second bracket bracket and a second hose connector of the first hose connector is flat, the first bracket and the second bracket, one side and one surface of the second bracket of the first bracket : it is fixed to one another so as to be in contact, opposite to the one surface of the first bracket The the other of the first connector pipe to the surface of the are arranged with one surface of the second bracket to co in which the second connector pipe is disposed on the other surface of the opposite side.
The first bracket has a first connector pipe disposed on a surface opposite to the surface facing the second bracket, and the second bracket has a first connector pipe disposed on a surface opposite to the surface facing the first bracket. Therefore, the first bracket and the second bracket can be arranged in contact with each other, and therefore, it is not necessary to provide a spacer between the first bracket and the second bracket as in the prior art.

At least one of the first bracket and the second bracket can be fixed to the mast of the forklift. In this case, it is preferable to fix both the first bracket and the second bracket to the mast of the forklift with a common bolt.
The hose connector mounting structure according to the present invention includes an outer mast standing on a machine base, a middle mast arranged to be movable up and down inside the out mast, and an inner mast arranged to be raised and lowered inside the middle mast. It can be applied to a three-stage mast type forklift, and in that case, at least one of the first bracket and the second bracket can be fixed to the inner mast.

  According to the present invention, a hose connector mounting structure for a forklift that can be easily assembled with a simple configuration is realized.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a diagram schematically showing a three-stage mast type forklift to which a hose connector mounting structure according to Embodiment 1 of the present invention is applied. This forklift has a pair of outer masts 1 erected on a machine base, a pair of middle masts 2 is provided inside the outer mast 1 so as to be movable up and down, and a pair of inner masts 3 inside the middle mast 2. Is provided to be movable up and down. Further, a lift bracket 4 is provided inside the inner mast 3 so as to be movable up and down. The lift bracket 4 includes various attachments 5 and working hydraulic pressures such as a hydraulic cylinder and a hydraulic motor for operating the attachments 5. A device 6 is attached.
The middle mast 2 is raised and lowered with respect to the outer mast 1 by a rear lift cylinder (not shown) connected to the outer mast 1 and the inner mast 3 is raised and lowered via a rear lift chain (not shown). Further, the lift bracket 4 is raised and lowered with respect to the inner mast 3 via a front lift chain (not shown) by a front lift cylinder 7 connected to the inner mast 3.

  An oil control valve 8 connected to a hydraulic pump (not shown) is installed on the base of the forklift, and this control valve 8 is connected to one end of the rear hose 10 via a rear pipe 9 fixed to the outer mast 1. ing. The rear hose 10 is hung on a hose pulley 11 installed on the upper part of the middle mast 2 and is disposed along the middle mast 2. The other end of the rear hose 10 is connected to the front via a connector pipe 12 of a hose connector. Connected to one end of the hose 13. The front hose 13 is hung on a hose pulley 14 installed on the upper part of the front lift cylinder 7 and is disposed along the front lift cylinder 7. The other end of the front hose 13 is fixed to the lift bracket 4. It is connected to the working hydraulic device 6 of the attachment 5 via the front pipe 15.

Here, in FIG. 1, for convenience of explanation, the rear pipe 9, the rear hose 10, the connector pipe 12 of the hose connector, the front hose 13, and the front pipe 15 are illustrated as one pipe, but these are two for feeding and one for returning, respectively. One working hydraulic pressure is composed of two rear pipes 9, two rear hoses 10, two connector pipes 12 of hose connectors, two front hoses 13 and two front pipes 15. One hydraulic system for driving the device 6 is configured.
The forklift is provided with first and second hydraulic systems for driving the two working hydraulic devices 6.

  As shown in FIGS. 2 to 4, the first hose connector 16 of the first hydraulic system has a flat plate-like first bracket 17, and the first hydraulic system is disposed on the upper surface of the first bracket 17. The two first connector pipes 18 for connecting the two rear hoses 10 and the two front hoses 13 are fixed. The first bracket 17 is formed with two bolt through holes 19 so as not to interfere with the fixed portion of the first connector pipe 18.

  Further, the second hose connector 20 of the second hydraulic system has a flat plate-like second bracket 21 formed larger than the first bracket 17, and as shown in FIG. Two second connector pipes 22 for connecting the two rear hoses 10 and the two front hoses 13 of the second hydraulic system are fixed to the lower surface of 21. Further, the second bracket 21 is formed with two tap holes 23 so as not to interfere with the fixed portion of the second connector pipe 22, and from the fixed portion of the second connector pipe 22 than the two tap holes 23. Two bolt through holes 24 are formed at separate positions.

A beam 25 is disposed between the pair of inner masts 3, and a connector fixing bracket 27 having two tap holes 26 is attached to the beam 25.
Further, the first bracket 17 and the second bracket 21 are fixed to each other by two bolts 28 so that the lower surface of the first bracket 17 and the upper surface of the second bracket 21 are in contact with each other, and the second bracket 21 is not shown 2. It is fixed to the connector fixing bracket 27 by two bolts.
The first connector pipe 18 and the second connector pipe 22 have fittings 18a and 22a at both ends, respectively, and the two rear hoses 10 and 2 of the corresponding hydraulic system via the fittings 18a and 22a. It is configured to be connected to the front hose 13 of the book.

At the time of assembly, first, with the lower surface of the second bracket 21 in contact with the upper surface of the connector fixing bracket 27, a bolt (not shown) is passed through the bolt through hole 24 of the second bracket 21 and the tap hole 26 of the connector fixing bracket 27. To fasten the second bracket 21 to the connector fixing bracket 27. Next, with the lower surface of the first bracket 17 in contact with the upper surface of the second bracket 21, the bolt 28 is passed through the bolt through hole 19 of the first bracket 17 and fastened to the tap hole 23 of the second bracket 21. Thus, the first bracket 17 is fixed to the second bracket 21. In this way, the first hose connector 16 and the second hose connector 20 are assembled on the beam 25 of the inner mast 3.
As the assembly order, the first bracket 17 and the second bracket 21 may be fixed to each other first, and then the second bracket 21 may be fixed to the connector fixing bracket 27.

As described above, in the first hose connector 16, the first connector pipe 18 is disposed on the upper surface of the first bracket 17, and in the second hose connector 20, the second connector pipe 22 is disposed on the lower surface of the second bracket 21. Therefore, the first bracket 17 and the second bracket 21 can be fixed in a state where they are in contact with each other. Therefore, it is not necessary to provide a spacer between the first bracket 17 and the second bracket 21 as in the prior art, whereby the number of members constituting this mounting structure is reduced and a simple configuration can be realized. At the same time, the manufacturing cost can be reduced.
In addition, since no spacer is required as described above, the number of members that must be held by hand during temporary assembly is reduced, and the first bracket 17 and the second bracket 21 are not connected via a spacer having a small contact area. Since the contact area is increased and the stability at the time of temporary assembly is improved, the assembly work can be easily performed.

  In the first embodiment, the bolt 28 used for fixing the first bracket 17 and the second bracket 21 does not penetrate the tap hole 23 of the second bracket 21 and protrude from the lower surface of the second bracket 21. The second hose connector 22 can also be disposed below the tap hole 23 of the second bracket 21.

Embodiment 2. FIG.
With reference to FIG. 5, a hose connector mounting structure for a forklift according to Embodiment 2 of the present invention will be described. The hose connector mounting structure according to the second embodiment includes the first bracket 32 of the first hose connector 31 and the second bracket 34 of the second hose connector 33 as shown in FIG. Are fixed to the connector fixing bracket 27 by a common bolt 35. Also in the second embodiment, the first connector pipe 36 is fixed to the upper surface of the first bracket 32 and the second connector pipe 37 is fixed to the lower surface of the second bracket 34 as in the first embodiment. . The first bracket 32 and the second bracket 34 are formed with bolt through holes 38 and 39 so as not to interfere with the first connector pipe 36 and the second connector pipe 37, respectively.

  In a state where the lower surface of the first bracket 32 and the upper surface of the second bracket 34 are in contact with each other, the bolt 35 is passed through the respective bolt through holes 38 and 39 of the first bracket 32 and the second bracket 34 to fix the connector. The first hose connector 31 and the second hose connector 33 are assembled on the beam 25 of the inner mast 3 by fastening to the tap hole 26 of the bracket 27 for use.

Even in such a configuration, the first connector pipe 36 is disposed on the upper surface of the first bracket 32, and the second connector pipe 37 is disposed on the lower surface of the second bracket 34. 34 can be fixed in contact with each other, and there is no need to provide a spacer between the first bracket 32 and the second bracket 34 as in the prior art. In addition, it is possible to realize a hose connector mounting structure that can be easily assembled with a simple configuration.
In addition, in the second embodiment, since the first bracket 32 and the second bracket 34 are fixed to the connector fixing bracket 27 by the common bolt 35, a simpler configuration can be obtained.

In the first and second embodiments described above, as shown in FIGS. 2 and 5, the first connector pipes 18 and 36 fixed to the upper surfaces of the first brackets 17 and 32 and the second brackets 21 and 34 are provided. The second connector pipes 22 and 37 fixed to the lower surface are arranged so as to extend substantially in parallel, but the extending directions of the first connector pipes 18 and 36 and the second connector pipes 22 and 37 intersect. It can also be arranged.
In the first and second embodiments described above, the first brackets 17 and 32 and the second brackets 21 and 34 are fixed to the connector fixing bracket 27 so as to be substantially horizontal when they are in contact with each other. However, instead, the first brackets 17 and 32 and the second brackets 21 and 34 are fixed to the connector fixing bracket 27 so as to be in a vertical direction or an oblique direction in a state where they are in contact with each other. You can also.

  Further, the first hose connectors 16 and 31 and the second hose connectors 20 and 33 are assembled on the beam 25 of the inner mast 3, but the present invention is not limited to this, and the lifting and lowering of the middle mast 2 and inner mast 3 and the lift bracket 4 are not limited thereto. If it can respond to the raising / lowering of the inner mast 3, it can also be assembled to the mast part of the inner mast 3 or other parts.

  In Embodiments 1 and 2 described above, the hose connector mounting structure of the present invention is applied to a three-stage mast type forklift. However, the present invention is not limited to this, and the front and rear hoses of the two hydraulic systems are respectively connected. Any one having two hose connectors for connection can be applied to various forklifts such as a two-stage mast type forklift.

It is a figure which shows typically the three-stage mast type forklift to which the hose connector attachment structure concerning Embodiment 1 of this invention is applied. It is an assembly drawing which shows the hose connector attachment structure which concerns on Embodiment 1 of this invention. It is an assembly drawing which shows the hose connector attachment structure which concerns on Embodiment 1 of this invention. It is an assembly drawing which shows the hose connector attachment structure which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the hose connector attachment structure which concerns on Embodiment 2 of this invention.

Explanation of symbols

  1 Outer mast, 2 Middle mast, 3 Inner mast, 4 Lift bracket, 5 Attachment, 6 Working hydraulic system, 7 Front lift cylinder, 8 Oil control valve, 9 Rear pipe, 10 Rear hose, 11, 14 Hose pulley, 12 Connector pipe, 13 Front hose, 15 Front pipe, 16 First hose connector, 17, 32 First bracket, 18, 36 First connector pipe, 18a, 22a Fitting, 19, 24, 38, 39 Bolt through hole, 20, 34 Second hose connector 21, 34 Second bracket, 22, 37 Second connector pipe, 23, 26 Tap hole, 25 beam, 27 Connector fixing bracket, 28, 35 bolts.

Claims (4)

For the forklift having the first and second hydraulic systems, the front hose and the rear hose of the first hydraulic system are connected to each other by the first connector pipe fixed to the first bracket of the first hose connector, and the second Forklift hose connector mounting structure for connecting the front hose and the rear hose of the hydraulic system to each other by a second connector pipe fixed to the second bracket of the second hose connector,
The first bracket of the first hose connector and the second bracket of the second hose connector are both flat.
Said first bracket and said second bracket, and one surface of the second bracket and the one surface of the first bracket is fixed to one another so as to contact,
The second connector pipe on the other surface opposite to the one surface of the second bracket with the one surface of the first bracket first connector pipe on the other side of the opposite side is arranged Forklift hose connector mounting structure characterized by being arranged.   The hose connector mounting structure for a forklift according to claim 1, wherein at least one of the first bracket and the second bracket is fixed to a mast of the forklift.   The hose connector mounting structure for a forklift according to claim 2, wherein both the first bracket and the second bracket are fixed to the mast of the forklift with a common bolt.   The forklift includes an outer mast erected on a machine base, a middle mast arranged to be movable up and down inside the outmast, and an inner mast arranged to be raised and lowered inside the middle mast, The hose connector mounting structure for a forklift according to claim 2 or 3, wherein at least one of a bracket and the second bracket is fixed to the inner mast.

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